Test Issue 429: No valid actions for NER after matcher adds a new entity label.

spacy/tests/regression/test_issue429.py

@@ -0,0 +1,29 @@
+from __future__ import unicode_literals
+import pytest
+
+import spacy
+from spacy.attrs import ORTH
+
+
+@pytest.mark.models
+def test_issue429():
+
+    nlp = spacy.load('en', parser=False)
+
+
+    def merge_phrases(matcher, doc, i, matches):
+      if i != len(matches) - 1:
+        return None
+      spans = [(ent_id, label, doc[start:end]) for ent_id, label, start, end in matches]
+      for ent_id, label, span in spans:
+        span.merge('NNP' if label else span.root.tag_, span.text, nlp.vocab.strings[label])
+
+    doc = nlp('a')
+    nlp.matcher.add('key', label='TEST', attrs={}, specs=[[{ORTH: 'a'}]], on_match=merge_phrases)
+    doc = nlp.tokenizer('a b c')
+    nlp.tagger(doc)
+    nlp.matcher(doc)
+        
+    for word in doc:
+        print(word.text, word.ent_iob_, word.ent_type_)
+    nlp.entity(doc)